Question

9(x) 2 -16=0 . Find value of x, by using the dicriminent formula

Answer 1

$9x^2-16=0\\\\a=9\\\\b=0\\\\c=-16\\\\D=b^2-4ac\\\\D = -4*9*-16\\\\D= 576$

x = ( - b ± √D ) / 2a

x = ± √576 / ( 2 × 9 )

x = ± 24 / 18

x = ± 4 / 3